RAWALPINDI, Pakistan — A suicide bomber killed 35 people outside a bank near Pakistan’s capital Monday, as the U.N. said spreading violence has forced it to start pulling out some expatriate staff and suspend long-term development work in areas along the Afghan border.

Hours after the first blast, another suicide bomber struck in the eastern city of Lahore, exploding a car at a police checkpoint as officers went to search it. At least seven policemen were injured and two were in critical condition, officials said.